Type wheel mounting for printing telegraphs



June 14, 1932. A. VISCHER, JR

TYPE WHEEL MOUNTING FOR PRINTING TELEGRAPHS Filed Aug. 28, 1930 Patented June 14, 1932 UNITED STATES PATENT OFFICE ALFRED VISCHER, .13., RIDGEWOOD, NEW- JERSEY, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE FINANCIAL PRESS COMPANIES OF AMERICA, OF BOSTON, MASSA- CHUSETTS, A TRUST OF MASSACHUSETTS Application filed August 28, 1980. Serial 'No. 478,532. 1

My invention relates to a receiver for printing telegraph system, and more particularly to an improved means for mounting the printing wheel on its shaft.

The invention will be understood by reference to the following description, taken in connection with the accompanying drawing, in which Fig. 1 is a front elevation of suiticient partsiof a receiver to illustrate the relation of the printing wheel mechanism thereto: Fig. 2 is a transverse section on the plane of the line 22 of Fig. 1; Fig. '3 is a vertical section on the plane of the line 3-3 of Fig. 2 and Fig. 4 is a horizontal section on the plane of the line 44 of Fig. 2. Similar reference numerals indicate similar parts in the several views.

In the operation of a printing telegraph receiver it is desirable that there shall be a fixed printing position for the wheel as otherwise the printed characters will not be in alinement. As the operation of the machine is very rapid, there is apt to occur an overthrow of the printing wheel when its shaft is located by the escapement 5. The

present invention has been designed to insure a fixed and definite printing position of the Wheel should there be either an overthrow or insufiicient rotation of the wheel with respect to the shaft.

Telegraph receivers of the type to which the present invention may be applied, are well known. For an understanding of the invention I have illustrated certain parts of a typical receiver, in which the numeral I designates the base and parts of the frame of the machine.

Supported in bearings in the upper portion of the end plates is a shaft 2 driven by a friction clutch 3, the driving member of which is a gear 4. Rotation of shaft 2 is controlled by an escapement, part of which is indicated by the wheel 5. Keyed on shaft 2 for rotation therewith, but slidably mounted thereon, so as to be moved back and forth, is a printing Wheel 6 having fixed to its pe riphery the characters to be printed. The construction is such that at each operation of a polarized magnet, not shown, the escapement wheel 5 will permit shaft 2 to rotate,

and the printing wheel to be set, as usual in machines of this type, and described, for example, in U. S. patent to G. S. Conger, No. 1,178,215, granted April 4, 1916. Surrounding the shaft 2 and free thereon is a bushing 7, providing a bearing for the printing wheel. This bushing is formed with the grpoved portion 7 adapted to receive the arms 8 of a bracket extending from a carriage 9, slidably mounted on a shaft 10. Any desired or suitable mechanism may be employed for imparting a step-by-step movement to the printing wheel along its shaft, such, for example, that described in said patent. I have shown, however, part of a mechanism described in a companion application filed August 28, 1930, Serial No. 478,531. This comprises two parallel arranged racks, one of which 11, is here shown.

Pivoted independently of each other on carriage 9 are pawls, one of which 11 is here shown, which engages the teeth of the racks. The pawls are held normally in engagement with the racks by springs 12. The construction is such that the racks are alternately v moved longitudinally in the same direction to effect the desired ,movement'of the printing wheel.

To carry out the object of the present invention, shaft 2 is formed with a V-shaped groove 2 adapted to receive a spline 13 having its lower part wedge-shaped to correspond to the walls of said groove. The upper part of the spline is slotted, as shown in Fig. 3, to receive a spring 14 clamped between the Walls of the slot by a screw' 15. This spring at one end is securely fastened by a screw 16 to the side of the printing wheel, and at its other end is in engagement with the under side of a groove in an eccentric 17, adjustably secured to the side of the cient rotation of wheel 6 to properly set the Wheel 6 in printing position, the pressure exerted on the spline by reason of the tension of spring 14 will automatically cause the wedge-shaped portion of the spline to bear against the walls of the groove to thereby bring the printing wheel to the position that it should assume to assure perfect alinement of the printed characters.

What I claim is:

1. In a printing telegraph receiver the combination of a printing wheel, a shaft on which said wheel is mounted and means for rotating the same, said shaft having a longitudinal groove therein, a spline fitting in said groove, and means resilientlf connecting said spline to said wheel to effect automatic adjustment of said spline in the groove of said shaft.

2. In a printing telegraph receiver the combination of a printing wheel, a shaft on which said wheel is mounted and means for rotating the same, said shaft having a longitudinal groove therein, a spring secured to the side of said wheel and a spline supported on said spring, said spline having a surface adapted to be seated in said groove and held therein by said spring. I

3. In a printing telegraph receiver the combination of a printing wheel, a shaft on which said wheel is mounted and means for rotating the same, said shaft having a longitudinal groove therein, a spring secured to the side of said wheel, a spline supported on said spring, said spline having a surface adapted to be seated in said groove and held therein by said spring, and means for adjusting the tension of said spring.

4. In a printing telegraph receiver the combination of a printing wheel, a shaft on which said-wheel is mounted and means for rotating the. same, said shaft having a lon-. gitudinal V-shaped groove therein, a spring fixed tothe side of said Wheel, a spline supported on said spring, said spline having a wedge-shaped section adapted to be seated in said groove, and means foradjusting the tension of said spring.

5. In a printing telegraph receiver the combination of a rotatable shaft, a printing wheel mounted on said shaft, said shaft having a longitudinal groove wider, at its open end than at its closed end, a spline fitting in said groove and engaging the Walls of said groove, and a resilient mounting on said wheel for said spline. K

Signed at New York, in the county of New York and State of New York this 26th day of August A. D. 1930.

ALFRED VISGHER, JR, 

